Cloth-cutting machine



Q Oct. 21 1924. 1512,12? H. MAIMIN E AL v v CLOTH CUTTING MACHINE Filed Jan. 4. 1922 2 SheetsJ-Sheet 1 H. MAIMIN ET AL CLOTH CUTTING MACHINE 2 Sheets-Sheet 2 Fild Jan. 4. 1922 Y M Rm Y m? T m A WW Patented Get. 21,

UNITED STATES HYMAN MAID/[IN AND AUGUST FREDDY, OF NEW YORK, N.

1,512,124 PATENT OFFICE.

As'sIGNoR-s TO B.

MAIMIN 00., INC., A. CORPORATION OF NEW YORK.

CLOTH-CUTTING MACHINE.

. Application filed January 4, 1922. Serial No. 526,872.

Our invention is an improvement in clothcutting machines and relates particularly to machines of the rotary type.

In machines of this character, the rotary knife or blade requires frequent grinding, and abrasive wheels or stones are commonly provided, pivotally mounted on the machine, to be swung at will into and out of operative position, with respect to the blade. Means are usually provided near the handle, for enabling the operator to move the abrasive wheels into operative position, without releasing his grasp of the handle. The most satisfactory results in sharpening are obtained when the abrasive wheels engage the rotary knife or blade at about the level of the center. The guard for the front of the blade should be arranged as near to the edge of the blade as is practical, for ob vious reasons, and when so arranged, it is not practicable to so arrange the abrasive wheels that they will engage the blade near the level of the center, without. interfering with the guard. To obviate this difliculty, such wheels have been arranged in front of the guard, that is with the guard between the abrasive wheels and the blade. When so mounted, however, it is necessary to move If the locking means are released the moment the wheels start toward the blade, and if the guard starts to swing out of its operative position simultaneously with the movement of r blade, this movement starts to release the 1 locking mechanism, but this release is not completed until the wheels have been swung down in front of the blade, and are just about to make contact therewith. When this point is reached, the lock is entirely re leased, the guard is swung out of operative position, and the Wheels are moved into contact with the blade. Inthis way, the blade is always protected either by the guard itself or by the wheels. We also provide a simple adjusting mechanism for the guard, for enabling it to be adjusted vertically, to any desired position. lVe furthermore provide a new and improved mounting for the abrasive wheels, so arranged as to provide a double or two-point bearing for each wheel, each bearing being beyond the plane of the wheel. v

In the accompanying drawings, which disclose a preferred embodiment of our invention,

Figure 1 is a side view of a cloth-cutting machine equipped with guard and abrasive wheels operated in accordance with the present invention,

Figure 2 is a view of the abrasive wheels and guard, looking at the opposite side from Figure 1,

Figure 3 is a front view of the rotary blade,

Figure 4 is a plan view with the motor removed, and the motor shaft in cross section,

Figure 5 is a horizontal section through the mounting for the abrasive wheels,

Figure 6 is a horizontal section at the locking pin.

In the present embodiment of the invention, the improved machine comprises a base 1, having a standard 2, carrying a support 3 at its top for the motor 4, and the cutting blade 5 is journaled on the standard, being connected to the shaft of the motor 4:, to be driven thereby. A handle 6 extends rearwardly from the standard, and by means of this the machine may be manipulated. This ly in an opening in the bracket 10. The pin has; a flange 12 at its inner end, which is arranged to engage one face of the guard 8, when the pin is in its outermost position,

and which is normally held in this position by a spring 13 which encircles. the pin between the head and the bracket. It will be evident that when the pin is. pressed inwardly, the flange v1 2 will release the guard, and the guard may be adjusted vertically.

The bracket 10 has a forked extension lent its inner side, and the arms of the fork are adapted to. engage a stop 15 on the lug 11, to limit the swinging movement of the bracket in either direction. Referring to Figure 4: itwill be seen that the guard 8 is lateral to the plane of the cutting blade, and the: bracket 10 is s o arranged that the guard is held ,sufticientlyfar in front of the cutting bladeto protect the operator. against injury, and it is normally held in this position, by means of a. spring 16 encircling the pivot l? of the bracket, and engaging at one end the stop 15 beforementioned. The other end of the spring engages the bracket. The bracket 10 is ;pivotally connected by a pivot pin 17, which also supports a double yoke 18.. The yoke has arms 19 engaging opposite sides of the lug 11 before mentioned, and pivoted thereto. by the pin 17. which supports the bracket 10. The yoke also has arms 2121 which carry the abrasive wheels to be do? scribed, and the yoke is mounted to be swung verticallyitoward and from'the cutting blade, by means of a trigger 22 pivoted to the, handle as indicated at 23. The pivot pin 17 of the yoke carries a gear segment 24:. meshing with a segment 25 pivoted on the standard, and the segment 25 is connected to V the trigger by means of a link 26. When the trigger.22 is swung toward the handle 6, the geansegment 24; is swung on its pivotal mounting, and partially rotates the segment 24, whichswings the yoke 18. A spring 26 is provided for returning the parts to normal position, t-hespring being arranged between the. trigger and the standard.

In common practice, the abrasive wheels used for sharpening the knives in cutters of this type are carried by a yoke and each wheel supported, either by a single stubshaft journa-led in one arm of the yoke, or mounted upon a common shaft extending between and journaled in the yoke arms, one of the wheels being fixed to this shaft. and the other loose ly journaled upon it. Neitherof these an rangements is satisfactory because the wheels are not rigidly journaled, and after a time they work loose in their bearing so that they do not act efiiciently, but on the contrar are likely to impair the cutting edge ofthe knife, In accordance with the present invention, we have provided a sunple double or two-point bearing foreach abrasive wheel, which acts very effectively' to prevent the loosening. described above, and which therefore keeps the wheels in true sharpening condition for a much longer time than is possible when usin the other types 7 threaded engagement with the. adjacent arm 21 of the yoke. Thescrews'BZ are in. aline ment, and the wheels are thus rotatably journaled in the screws. A shaft .33 is journaled. within the bushings, the shaft extending across the space betweenithe adjacentrends of the bushings, and to near the outer :ends of the bushings, being however spaced. from the said ends as clearly shownin Figure. I -i' l ashers 84 encircle the shaft within the ccunter-bores28 of the wheels,;and;a.coil springv 35 arranged between the. washers,- the spring normally holding the wheels against the locking rings 30. The arms. 2l-2l are split as shown, the chambered screws 32 being held. betweenthe split .portions thereof. Byloosening screws 37 which connect the sections of the thescrews 32 arereleased so that they may be, adjusted, and they are lookedin adjusted position by means of the screws 37. By thus mounting. the abrasive wheels, each wheel hastwo:

bearings, each situated beyond its own plane.

One of these hearings is that of thereduced:

portion of the bushing'or stub shaft 31 in the I.

chambered screw and the other is that of the shaft @311] the bushing 29 of. theother wheel. This arrangement makes for a rigid.

support so that the-wheels not likely to Work loose in their bearings. r I

Referring to, Figure 3, it will be seenthat the arm 21 of the yoke .18 extends in front of the guard 8, and is in position tozengage. the guard below the bracket 10, when the abras ve wheels are swungdownwardly into grinding pos1t1on,.-and to swing the guard 1n beyond the edge of the cuttinggblade,into:-

a position where it will not interfere with the operation of the said wheels. Thus when the abrasive wheels are swung into operative position, the guard is moved inwardly, and when the abrasive wheels swing into inoperative position, the spring 16 moves the guard back into normal position.

It is necessary, however, that the guard be locked in such position, otherwise it would swing inwardly when engaged by the hand of the operator, for instance, permitting the hand to strike the cutting blade. It is also essential that the locking means be automatically released when the abrasive wheels are swung toward operative position, and just before the arm 21 of the yoke engages the guard. For locking the guard in operative position, we provide a locking pin 37, which is mounted to slide in an opening in the lug 11 before mentioned, toward and from the forked extension 14 of the bracket 10. This extension has an opening 88 for engagement by the pin, and the pin is normally pressed toward the opening by a spring 39, which is arranged between the lug 11 and a flange or rib 40 on the pin. IVhen the guard is in normal position, the spring 40 presses the pin into engagement with the opening 38 of the fork extension, and mechanism is provided on one of the arms 19 of the yoke for releasing the pin. Such mechanism is in the form of a cam extension 41, which is adapted to engage beneath the head of the pin 37 and referring to Figure 1, it will be seen that the face of the head adjacent to the pin is bevelled to cooperate with the cam extension. When the yoke 18 is swung downwardly toward operative position, and just before the arm 21 engages the guard, the cam extension releases the pin 37", which releases the bracket 10, so that as the arm 21 of the yoke engages the same, the guard is free to move inwardly to inoperative position, where it will not interfere with the operation of the cutting blade.

We claim 1. In a cloth-cutting machine, the combination of a cutting blade, a guard therefor arranged laterally with respect to the plane of the blade and mounted to swing into inoperative position alongside the blade, sharpening means mounted to move into grinding contact with the blade and having means for engaging the guard to move the same into inoperative position, normally operative means for looking the guard in operative position, said locking means being released during the first part of the movement of the sharpening means toward the blade.

2. In a cloth-cutting machine, the combination of a cutting blade, a guard therefor arranged laterally with respect to the plane of the blade and mounted to swing into inoperative position alongside the blade, sharpening means mounted to move into grinding contact with the blade and having means for engaging the guard to move the same into inoperative position, a spring pressed locking pin for engaging the guard to hold it in operative position, and a cam carried by the sharpening means for engaging the pin to release the same.

3. In a cloth-cutting machine, the combination with the frame and the rotary blade, of a guard for the blade pivotally movable with respect to the frame, a pin mounted to slide in the frame transversely of the guard and having means for engaging the same to hold it from pivotal movement, and a spring pressing the pin toward the guard.

4. In a cloth-cutting machine, the combination of a blade, a guard therefor, locking means holding the guard in operative position, sharpening means for the blade, means for moving the sharpening means into contact with the blade, means for releasing the locking means just before the sharpening means contact with the blade, and means for moving the guard out of operative position when the locking means are released.

5. In a cloth-cutting machine, the combination of a cutting blade, a guard therefor arranged laterally with respect to the plane of the blade and mounted to swing out of inoperative position alongside the blade, normally operative means for locking the guard in operative position, sharpening means mounted to swing into grinding contact with the blade, and having means for engaging the guard to move the same into inoperative position, and means for releasing the locking means during the first part of the swinging movement of the sharpening means toward the blade, said locking means being completely released when the sharpening means engage the guard.

6. In a cloth-cutting machine, the combination of a rotary blade, a guard therefor, pivoted to swing in a plane parallel to the plane of the blade into and out of operative position, abrasive wheels carried by a yoke pivoted to swing into and out of operative relation to the blade, normally operative means for locking the guard in operative position, means carried by the yoke for releasing the locking means during the first part of the movement of the abrasive wheels toward the blade, the release of the locking means being complete when the yoke contacts with the guard; whereby further movement of the wheels toward the blade swings the guard out of operative position.

In testimony whereof we afiix our signatures.

HYMAN MAIMIN. AUGUST FREDDY. 

